Patent US3900938A successfully refreshed from Google Patents.
US3900938A
Expired / Lapsed
US
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Hydraulic cylinder service machine
Assignee: Tuxco Corp
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Filing: 1974-10-21
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Granted: 1975-08-26
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Expires: 1994-10-21
Abstract
Abstract A hydraulic cylinder service machine which includes a generally rectangular frame and a horizontal central mounting post supported thereon. The central mounting post has extensions which are adjustable in length allowing the machine to handle and mount a wide variety of cylinders for repair. A housing receiving chuck, housing retaining rollers, and piston rod retainer are adjustably secured on the central mounting post. A housing cap retainer may be adjustably secured to the central mounting post or be portable for separate use in the field. A hydraulic mechanism at one end of the frame operates to remove and replace the cylinder housing cap and piston rod nut of a cylinder while it is being held on the machine. The hydraulic mechanism may also be portable for use in the field together with the housing cap retainer.
Inventors
- 👤 Sr Oscar C Blomgren
- 👤 Oscar C Blomgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:56
CPC Classifications
B; B23; B23P; B23P19/00; B23P19/04; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53687
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
196 words
A hydraulic cylinder service machine for servicing a hydraulic cylinder wherein the cylinder includes a hollow cylindrical housing closed at one end and open at the other end, a piston slidably received in the housing, a rod connected to said piston at one end by a piston retaining nut and having an external mounting member on the other end and extending through the open end of the housing, and a cap having a central aperture therethrough threadedly secured to the open end of the housing retaining said piston therein and having an aperture through which the rod is guided, said machine comprising, a frame having a substantially rectangular form and support means, a tubular post means attached in horizontal position to said frame, first means selectively connected to or slidable relative said post means for receiving and retaining said cylinder housing, second means coacting with said post means for receiving and retaining said housing cap, means for preventing rotation of one of the first or second means, and hydraulic means for causing rotation of the other of said first or second means for removing said cap from said housing or replacing the cap on the housing.
Claim 2
Dependent Claim
196 words
A hydraulic cylinder service machine for servicing a hydraulic cylinder wherein the cylinder includes a hollow cylindrical housing closed at one end and open at the other end, a piston slidably received in the housing, a rod connected to said piston at one end by a piston retaining nut and having an external mounting member on the other end and extending through the open end of the housing, and a cap having a central aperture therethrough threadedly secured to the open end of the housing retaining said piston therein and having an aperture through which the rod is guided, said machine comprising, a frame having a substantially rectangular form and support means, a tubular post means attached in horizontal position to said frame, first means selectively connected to or slidable relative said post means for receiving and retaining said cylinder housing, second means coacting with said post means for receiving and retaining said housing cap, means for preventing rotation of one of the first or second means, and hydraulic means for causing rotation of the other of said first or second means for removing said cap from said housing or replacing the cap on the housing.
Claim 3
Dependent Claim
40 words
The hydraulic cylinder service machine of claim 1, wherein said post means includes, a first member mounted on said frame, and a second member telescopically received in said first member at one end thereof for providing post means length extensibility.
Claim 4
Dependent Claim
21 words
The hydraulic cylinder service machine of claim 1, wherein said first means includes, chuck means rotatably mounted on said post means.
Claim 5
Dependent Claim
34 words
The hydraulic cylinder service machine of claim 3, wherein said first means further includes, support means for maintaining said cylinder housing in a spaced relation to at least a portion of said post means.
Claim 6
Dependent Claim
41 words
The hydraulic cylinder service machine of claim 1, wherein said second means for receiving and retaining said housing cap includes a non-rotatable adjustable spanner Wrench-type retainer and means for adjustably mounting same on said central mounting means relative said first means.
Claim 7
Dependent Claim
52 words
The hydraulic cylinder service machine of claim 5, wherein said spanner wrench-type retainer includes a pair of upstanding arm members, each arm member having a horizontally inwardly facing protrusion for engaging said housing cap, means for adjustably retaining said arm members on said post means to vary the distance between said protrusions.
Claim 8
Dependent Claim
57 words
The hydraulic cylinder service machine of claim 1 wherein said second means includes a portable adjustable spanner wrench-type retainer, and said means for preventing the rotation thereof includes an elongated member on said retainer which when said retainer is mounted on said cylinder cap is capable of impinging said frame and thereby be restrained from further rotation.
Claim 9
Dependent Claim
74 words
The hydraulic cylinder service machine of claim 3, wherein said cylinder further includes at least one ear with an opening therethrough for pivotal mounting of the housing, and said chuck means comprises, a head portion, and members extending from said head portion having aligned pin openings, and a pin coacting with the pin openings of the chuck members and opening of said cylinder ear to retain said cylinder for rotation with said chuck means.
Claim 10
Dependent Claim
75 words
The hydraulic cylinder service machine of claim 8, wherein said hydraulic means includes, a portable hydraulic ram including means for operating said ram, moment arm means mounted in fixed rotational relation to said chuck means for pivotally retaining one end of said portable hydraulic ram, and stationary retaining means on said post means for pivotally retaining the other end of said portable hydraulic ram whereby extension of said hydraulic ram forces said chuck to rotate.
Claim 11
Dependent Claim
78 words
The hydraulic cylinder service machine of claim 8 wherein said hydraulic means includes a portable torquing means capable of providing torque to said chuck means in fixed rotational connection thereto and also capable of providing torque elsewhere when disconnected from said chuck means including, a frame, a hydraulic ram insertable in said frame and means for operating said ram, and moment arm means rotatably mounted in said frame for pivotal connection to one end of said hydraulic ram.
Claim 12
Dependent Claim
28 words
The hydraulic cylinder service machine of claim 1, further comprising third means selectively connected to or slidable along said post means for receiving and retaining said piston rod.
Claim 13
Dependent Claim
25 words
The hydraulic cylinder service machine of claim 3, which further includes, drive means for selectively extending or retracting said second member from said post means.
Claim 14
Dependent Claim
32 words
The hydraulic cylinder service machine of claim 3, further comprising socket means detachably mountable in fixed rotational relation to said chuck means for removing the cylinder piston retaining nut from the rod.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |